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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-2500) A Linux-specific Directory impl that bypasses the buffer cache
Date Tue, 15 Jun 2010 13:15:22 GMT
A Linux-specific Directory impl that bypasses the buffer cache
--------------------------------------------------------------

                 Key: LUCENE-2500
                 URL: https://issues.apache.org/jira/browse/LUCENE-2500
             Project: Lucene - Java
          Issue Type: Improvement
          Components: contrib/*
            Reporter: Michael McCandless
            Assignee: Michael McCandless


I've been testing how we could prevent Lucene's merges from evicting
pages from the OS's buffer cache.  I tried fadvise/madvise (via JNI)
but (frustratingly), I could not get them to work (details at
http://chbits.blogspot.com/2010/06/lucene-and-fadvisemadvise.html).

The only thing that worked was to use Linux's O_DIRECT flag, which
forces all IO to bypass the buffer cache entirely... so I created a
Linux-specific Directory impl to do this.


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